Add speaking endpoints and clean code.

helper/speech_to_text_helper.py

@@ -0,0 +1,11 @@
+import whisper
+import os
+
+def speech_to_text(file_path):
+    if os.path.exists(file_path):
+        model = whisper.load_model("base")
+        result = model.transcribe(file_path, fp16=False, language='English', verbose=False)
+        return result["text"]
+    else:
+        print("File not found:", file_path)
+        raise Exception("File " + file_path + " not found.")